How to switch off "propose new Time" on a Meeting with CDO?

Hello
Does anybody know how to programatically switch off the button 'propose new
time' on a meeting request?
On the Menu 'Action' is a option 'Allow new time Proposals'. Also in Outlook
under Options/Calendar.. is a button to generally switch off the 'propose
new time' button.
I could not find a way to switch it off on my own meeting request created via CDO.

To find this property I sent meetings with the same
User from different PC's. The recipient was both times the same.
On one machine I switched the "Allow new times proposal..." option off, and
on the other I switched it on. Well I got two meeting requests one with the
button and one with disabled (invisible) button.

Question:
How is it possible to see on which object this property is saved and change it with
CDO1.21?
This property must be saved somewhere in the profile and on the message.

I for example checked the Current User object, but this yields to nothing.
There are 34 properties but not a property 0x8366 or 0x825A.
Is the Conversion from 8366000B to -2090467317 correct? (see code below)
Any help really(!) welcome
Sepp

At first sight I didn't get a hint. But surely intersting. Well, I know how to set a property, the trouble is, I havn't found a CDO object which contains this property (neither -2090467317 nor 2204499979. )

Get people started with the process of using Access VBA to control Outlook using automation, Microsoft Access can control other applications. An example is the ability to programmatically talk to Microsoft Outlook. Using automation, an Access applic…

This video shows how to remove a single email address from the Outlook 2010 Auto Suggestion memory.
NOTE: For Outlook 2016 and 2013 perform the exact same steps.
Open a new email: Click the New email button in Outlook.
Start typing the address: …